Code No: RR10301

Set No. 1

I B.Tech Supplimentary Examinations, February 2008 ENGINEERING CHEMISTRY ( Common to Mechanical Engineering, Mechatronics, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Name the diﬀerent ingredients present in paints. (b) Explain why stainless steel is resistant to atmospheric corrosion. (c) Distinguish between diﬀerential aeration corrosion and diﬀerential metal corrosion. [5+6+5] 2. (a) How is PVC prepared and what are its uses? (b) Write down the diﬀerences between compression and injection moulding techniques. (c) How is Thiokol prepared? Mention its uses. 3. (a) What is meant by “hardness” of water? (b) What are the major disadvantages of hard water when used for i. domestic purposes. ii. industrial purposes and iii. steam generation in boilers? [4+6+6]

6. (a) With a neat diagram describe the orsat gas analysis method. What are the special precaution to be taken in the measurement . (b) Deﬁne caloriﬁc values of a fuel. Distinguish gross and net caloriﬁc value. [8+8] 7. What are Refractories? Explain Thermal spalling, strength and porosity of the refractories. [16] 8. Write a note on lubricants with special reference to their classiﬁcation, mode of action, examples and applications. [16] 1 of 2

Code No: RR10301 ⋆⋆⋆⋆⋆

Set No. 1

2 of 2

Code No: RR10301

Set No. 2

I B.Tech Supplimentary Examinations, February 2008 ENGINEERING CHEMISTRY ( Common to Mechanical Engineering, Mechatronics, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What is a drying oil? Give two examples. (b) Compare the uniform corrosion and pitting corrosion. (c) Explain Sacriﬁcial anode method in detail. 2. (a) What is Nylon and how is it prepared? (b) Explain any one of the mechanism of addition polymerization. Using a suitable example. (c) Describe the important uses of PVC. [6+6+4] [5+6+5]

3. (a) Describe the principle and procedure involved in the zeolite process used for the treatment of water. (b) What are the advantages and disadvantages of Zeolite process over lime-soda process? [8+8] 4. Determine the total hardness of a sample of water in 0 Fr and 0 Clarke which showed the following analysis :- Suspended matter = 100 mg; Ca(NO3 )2 = 16.4 mg/litre; MgSO4 = 24 mg/litre; MgCl2 = 19 mg/litre; NaOH = 40 mg/litre; KOH = 56 mg/litre ( At. Masses of Na = 23, Mg = 24, K = 39 and Ca = 40.) [16] 5. (a) What is coal? How it is formed? Discuss the qualities of a good coal. (b) Give the Classiﬁcation of coal and explain each class with example. [8+8]

6. (a) With a neat diagram describe the orsat gas analysis method. What are the special precaution to be taken in the measurement . (b) Deﬁne caloriﬁc values of a fuel. Distinguish gross and net caloriﬁc value. [8+8] 7. (a) How are the refractories are classiﬁed? Give one example for each class. (b) Write a note on the conditions leading to failure of a refractory material. [8+8] 8. Explain the following two theories for the mechanism of the lubricants. (a) Boundary lubrication (b) Extreme pressure lubrication. ⋆⋆⋆⋆⋆ [8+8]

6. (a) Discuss in detail Bergius procedure for the manufacture of synthetic petrol. (b) What are the characteristics of a good Fuel? [8+8]

7. What are Refractories? Explain Thermal spalling, strength and porosity of the refractories. [16] 8. Deﬁne lubricant. Discuss the important properties of the lubricating oils. ⋆⋆⋆⋆⋆ [16]

1 of 1

Code No: RR10301

Set No. 4

I B.Tech Supplimentary Examinations, February 2008 ENGINEERING CHEMISTRY ( Common to Mechanical Engineering, Mechatronics, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What is a drying oil? Give two examples. (b) Compare the uniform corrosion and pitting corrosion. (c) Explain Sacriﬁcial anode method in detail. 2. (a) Write down any two distinguishing features of PVC. (b) Explain the diﬀerences between thermo set and thermo plastics. (c) What is moulding of plastics? Explain compression moulding technique in detail. [5+5+6] 3. (a) Explain the diﬀerent steps used in the puriﬁcation of drinking water. (b) Discuss the EDTA method for the determination of permanent hardness of water. [8+8] 4. Calculate the temporary, permanent and total hardness in mg/litre of a sample of water containing the following salts :- Mg(HCO3 )2 = 14.6mg/litre; Ca(HCO3 )2 = 16.2 mg/litre MgCl2 = 9.5mg/litre; CaSO4 = 13.6 mg/litre ( Assume the atomic mass of Ca to be 40 and that of Mg to be 24). [16] 5. (a) What is octane number? Explain how the molecular structure will aﬀect the octane number. (b) What is leaded petrol? Discuss its advantages and disadvantages. (c) Describe the fractional distillation of petroleum. [6+5+5] [5+6+5]

6. (a) With a neat diagram describe the orsat gas analysis method. What are the special precaution to be taken in the measurement . (b) Deﬁne caloriﬁc values of a fuel. Distinguish gross and net caloriﬁc value. [8+8] 7. What are electrical insulators? Describe the characteristics and engineering applications of these materials. [16] 8. Deﬁne lubricant. Discuss the important properties of the lubricating oils. ⋆⋆⋆⋆⋆ [16]